<!DOCTYPE html><html lang="en" xmlns:th="http://www.thymeleaf.org"><head>    <meta charset="UTF-8">    <title>登录</title></head><body><form action="/doLogin" method="post">    用户名：<input name="username"> <br/>    密码： <input name="password" type="password"><br/>    <input type="hidden" name="url" th:value="${url}">    <input type="submit" value="登录"></form></body></html>